Set the default value for accepted TLD's to match the IANA TLD list.

Change-Id: Ie62bd1c174b2eed2620a1b8fba5a93d7bddf4711
Add localhost, localdomain and local and remove com, net, org from default blacklist.

com, net, org are now blocked simply by being a single label domain name.

Change-Id: I2527199580a9d140e9171d95266831494460d5d7